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+/*
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * Copyright (c) 2009 Helge Bahmann
+ * Copyright (c) 2012 Tim Blechmann
+ * Copyright (c) 2013 - 2014 Andrey Semashev
+ */
+/*!
+ * \file   atomic/detail/storage_type.hpp
+ *
+ * This header defines underlying types used as storage
+ */
+
+#ifndef BOOST_ATOMIC_DETAIL_STORAGE_TYPE_HPP_INCLUDED_
+#define BOOST_ATOMIC_DETAIL_STORAGE_TYPE_HPP_INCLUDED_
+
+#include <cstddef>
+#include <boost/cstdint.hpp>
+#include <boost/atomic/detail/config.hpp>
+#if !defined(BOOST_ATOMIC_DETAIL_HAS_BUILTIN_MEMCMP) || !defined(BOOST_ATOMIC_DETAIL_HAS_BUILTIN_MEMCPY)
+#include <cstring>
+#endif
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#pragma once
+#endif
+
+namespace boost {
+namespace atomics {
+namespace detail {
+
+template< typename T >
+BOOST_FORCEINLINE void non_atomic_load(T const volatile& from, T& to) BOOST_NOEXCEPT
+{
+    to = from;
+}
+
+template< std::size_t Size >
+struct buffer_storage
+{
+    BOOST_ALIGNMENT(16) unsigned char data[Size];
+
+    BOOST_FORCEINLINE bool operator! () const BOOST_NOEXCEPT
+    {
+        return (data[0] == 0u && BOOST_ATOMIC_DETAIL_MEMCMP(data, data + 1, Size - 1) == 0);
+    }
+
+    BOOST_FORCEINLINE bool operator== (buffer_storage const& that) const BOOST_NOEXCEPT
+    {
+        return BOOST_ATOMIC_DETAIL_MEMCMP(data, that.data, Size) == 0;
+    }
+
+    BOOST_FORCEINLINE bool operator!= (buffer_storage const& that) const BOOST_NOEXCEPT
+    {
+        return BOOST_ATOMIC_DETAIL_MEMCMP(data, that.data, Size) != 0;
+    }
+};
+
+template< std::size_t Size >
+BOOST_FORCEINLINE void non_atomic_load(buffer_storage< Size > const volatile& from, buffer_storage< Size >& to) BOOST_NOEXCEPT
+{
+    BOOST_ATOMIC_DETAIL_MEMCPY(to.data, const_cast< unsigned char const* >(from.data), Size);
+}
+
+template< std::size_t Size, bool Signed >
+struct make_storage_type
+{
+    typedef buffer_storage< Size > type;
+
+    struct aligned
+    {
+        type value;
+
+        BOOST_DEFAULTED_FUNCTION(aligned(), {})
+        BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type const& v) BOOST_NOEXCEPT : value(v) {}
+    };
+};
+
+template< >
+struct make_storage_type< 1u, false >
+{
+    typedef boost::uint8_t type;
+
+    struct aligned
+    {
+        type value;
+
+        BOOST_DEFAULTED_FUNCTION(aligned(), {})
+        BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type v) BOOST_NOEXCEPT : value(v) {}
+    };
+};
+
+template< >
+struct make_storage_type< 1u, true >
+{
+    typedef boost::int8_t type;
+
+    struct aligned
+    {
+        type value;
+
+        BOOST_DEFAULTED_FUNCTION(aligned(), {})
+        BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type v) BOOST_NOEXCEPT : value(v) {}
+    };
+};
+
+template< >
+struct make_storage_type< 2u, false >
+{
+    typedef boost::uint16_t type;
+
+    struct aligned
+    {
+        BOOST_ALIGNMENT(2) type value;
+
+        BOOST_DEFAULTED_FUNCTION(aligned(), {})
+        BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type v) BOOST_NOEXCEPT : value(v) {}
+    };
+};
+
+template< >
+struct make_storage_type< 2u, true >
+{
+    typedef boost::int16_t type;
+
+    struct aligned
+    {
+        BOOST_ALIGNMENT(2) type value;
+
+        BOOST_DEFAULTED_FUNCTION(aligned(), {})
+        BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type v) BOOST_NOEXCEPT : value(v) {}
+    };
+};
+
+template< >
+struct make_storage_type< 4u, false >
+{
+    typedef boost::uint32_t type;
+
+    struct aligned
+    {
+        BOOST_ALIGNMENT(4) type value;
+
+        BOOST_DEFAULTED_FUNCTION(aligned(), {})
+        BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type v) BOOST_NOEXCEPT : value(v) {}
+    };
+};
+
+template< >
+struct make_storage_type< 4u, true >
+{
+    typedef boost::int32_t type;
+
+    struct aligned
+    {
+        BOOST_ALIGNMENT(4) type value;
+
+        BOOST_DEFAULTED_FUNCTION(aligned(), {})
+        BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type v) BOOST_NOEXCEPT : value(v) {}
+    };
+};
+
+template< >
+struct make_storage_type< 8u, false >
+{
+    typedef boost::uint64_t type;
+
+    struct aligned
+    {
+        BOOST_ALIGNMENT(8) type value;
+
+        BOOST_DEFAULTED_FUNCTION(aligned(), {})
+        BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type v) BOOST_NOEXCEPT : value(v) {}
+    };
+};
+
+template< >
+struct make_storage_type< 8u, true >
+{
+    typedef boost::int64_t type;
+
+    struct aligned
+    {
+        BOOST_ALIGNMENT(8) type value;
+
+        BOOST_DEFAULTED_FUNCTION(aligned(), {})
+        BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type v) BOOST_NOEXCEPT : value(v) {}
+    };
+};
+
+#if defined(BOOST_HAS_INT128)
+
+template< >
+struct make_storage_type< 16u, false >
+{
+    typedef boost::uint128_type type;
+
+    struct aligned
+    {
+        BOOST_ALIGNMENT(16) type value;
+
+        BOOST_DEFAULTED_FUNCTION(aligned(), {})
+        BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type v) BOOST_NOEXCEPT : value(v) {}
+    };
+};
+
+template< >
+struct make_storage_type< 16u, true >
+{
+    typedef boost::int128_type type;
+
+    struct aligned
+    {
+        BOOST_ALIGNMENT(16) type value;
+
+        BOOST_DEFAULTED_FUNCTION(aligned(), {})
+        BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type v) BOOST_NOEXCEPT : value(v) {}
+    };
+};
+
+#elif !defined(BOOST_NO_ALIGNMENT)
+
+struct storage128_t
+{
+    boost::uint64_t data[2];
+
+    BOOST_FORCEINLINE bool operator! () const BOOST_NOEXCEPT
+    {
+        return data[0] == 0 && data[1] == 0;
+    }
+};
+
+BOOST_FORCEINLINE bool operator== (storage128_t const& left, storage128_t const& right) BOOST_NOEXCEPT
+{
+    return left.data[0] == right.data[0] && left.data[1] == right.data[1];
+}
+BOOST_FORCEINLINE bool operator!= (storage128_t const& left, storage128_t const& right) BOOST_NOEXCEPT
+{
+    return !(left == right);
+}
+
+BOOST_FORCEINLINE void non_atomic_load(storage128_t const volatile& from, storage128_t& to) BOOST_NOEXCEPT
+{
+    to.data[0] = from.data[0];
+    to.data[1] = from.data[1];
+}
+
+template< bool Signed >
+struct make_storage_type< 16u, Signed >
+{
+    typedef storage128_t type;
+
+    struct aligned
+    {
+        BOOST_ALIGNMENT(16) type value;
+
+        BOOST_DEFAULTED_FUNCTION(aligned(), {})
+        BOOST_FORCEINLINE BOOST_CONSTEXPR explicit aligned(type const& v) BOOST_NOEXCEPT : value(v) {}
+    };
+};
+
+#endif
+
+template< typename T >
+struct storage_size_of
+{
+    enum _
+    {
+        size = sizeof(T),
+        value = (size == 3 ? 4 : (size >= 5 && size <= 7 ? 8 : (size >= 9 && size <= 15 ? 16 : size)))
+    };
+};
+
+} // namespace detail
+} // namespace atomics
+} // namespace boost
+
+#endif // BOOST_ATOMIC_DETAIL_STORAGE_TYPE_HPP_INCLUDED_